We added this "Disc Run" to the exhibit to create a multi-level experience on the Treehouse. Children can insert wooden discs from the ground and watch them plink around in the Pachinko machine, or they can start the discs from the top with a rotating wheel that can set the disc rolling in any direction. The cut-out patterns are beautiful and nature-themed, but they also provide important peeking spaces for children under the Treehouse and their watchful parents.